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https://github.com/justinian/jsix.git
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ab31825ab3
Restructuring paging into an object that carries its page cache with it and makes for simpler code. Program loading is also changed to not copy the pages loaded from the file into new pages - we can impose a new constraint that anything loaded by boot have a simple, page-aligned layout so that we can just map the existing pages into the right addresses. Also included are some linker script changes to help accommodate this.
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
#pragma once
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#include <stdint.h>
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#include <util/counted.h>
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#include "cpu.h"
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namespace panic {
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constexpr uint32_t send_nmi_command =
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(4 << 8) | // Delivery mode NMI
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(1 << 14) | // assert level high
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(2 << 18); // destination all
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extern uint32_t *apic_icr;
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extern void const *symbol_table;
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[[ noreturn ]]
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__attribute__ ((always_inline))
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inline void panic(
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const char *message = nullptr,
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const cpu_state *user = nullptr,
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const char *function = __builtin_FUNCTION(),
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const char *file = __builtin_FILE(),
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uint64_t line = __builtin_LINE())
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{
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cpu_data &cpu = current_cpu();
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// Grab the global panic block for ourselves
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cpu.panic = __atomic_exchange_n(&g_panic_data_p, nullptr, __ATOMIC_ACQ_REL);
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// If we aren't the first CPU to panic, cpu.panic will be null
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if (cpu.panic) {
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cpu.panic->symbol_data = symbol_table;
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cpu.panic->user_state = user;
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cpu.panic->message = message;
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cpu.panic->function = function;
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cpu.panic->file = file;
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cpu.panic->line = line;
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cpu.panic->cpus = g_num_cpus;
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*apic_icr = send_nmi_command;
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}
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while (1) asm ("hlt");
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}
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/// Install a panic handler.
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/// \arg entrypoint Virtual address of the panic handler's entrypoint
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/// \arg symbol_data Symbol table data
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void install(uintptr_t entrypoint, util::const_buffer symbol_data);
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} // namespace panic
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#ifndef NDEBUG
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__attribute__ ((always_inline))
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inline void kassert(
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bool check,
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const char *message = nullptr,
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const cpu_state *user = nullptr,
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const char *function = __builtin_FUNCTION(),
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const char *file = __builtin_FILE(),
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uint64_t line = __builtin_LINE())
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{
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if (!check)
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panic::panic(message, user, function, file, line);
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}
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#define assert(x) kassert((x))
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#else // NDEBUG
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#define kassert(...) ((void)0)
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#define assert(x) ((void)0)
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#endif // NDEBUG
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